I have another to add to your list that’s almost as easy to do as going for a daily walk! Clean up litter outside commercial properties for property management companies. The work is done on foot using simple hand tools. I started this as a side gig in 1981 and grew it into a profitable full-time business that I continue to operate today. I share my experience in my book, Cleanlots, and offer free support.
Having a eureka moment is great, but it can be hard to put that idea down on paper in a way that will speak to a potential investor. If you have owned your own business in the past or earned a business degree, why not help those with a eureka moment start something they love? Plan your fee around the various packages you are prepared to offer your clients. You can either:

If you have a great product, but no money to invest in a physical storefront, staff, and bills, why not set yourself up online? Aside from the lack of huge monetary investment and time commitment, the marketing opportunities online are endless. Also, although a storefront is great for branding purposes, it does limit the size and scope of your audience. By setting yourself up with an e-commerce store, you can:
More and more companies and startups especially are embracing remote work—where you use online collaboration and communication tools to do your work from wherever you want. And you don’t have to be a 20-something hotshot designer or coder to reap the benefits of working remotely. Many remote positions are for customer support positions or other customer-facing positions that don’t require specialized skill sets.

After you register your business, you may need to get an employer identification number (EIN) from the IRS. While this is not required for sole proprietorships with no employees, you may want to apply for one anyway to keep your personal and business taxes separate, or simply to save yourself the trouble later if you decide to hire someone else. The IRS has provided a checklist to determine whether you will require an EIN to run your business. If you do need an EIN, you can register online for free.
This is an especially easy business to start if you live in an urban area, as many businessmen and women prefer having a driver to go to and from work in order to make calls, schedule meetings, and generally work on the operational aspects of their companies during that time. On the other hand, if you are looking to start a business that is more like a taxi service, why not become an Uber driver? To become an Uber driver, you need:

The restaurant chef is not the only person that has a say on what goes on the menu. High-end restaurants often find themselves indecisive when it comes to the food they want to serve, especially as seasons change. A menu planning business is a very low-cost idea, but is perfect for those who love to work with food without any direct involvement in preparing or serving it. Many places are willing to hire a consultant to design their seasonal menus, so visit local restaurants and make them aware of your culinary skill set.
As you start regularly putting out content, you’ll hopefully start to build a bit of an audience. But to start seeing real money from YouTube you need to market your videos elsewhere. Share your channel on Twitter and Facebook. Distribute videos anywhere else you can think of. Also, interact with comments and build a community around the videos you’re making so people will share it with their friends.
To test these websites, you’ll be asked to visit the site in question and record your reactions and thoughts as you go through it. To get started making extra money online by testing websites, sign up for some of the most popular services like UserTesting.com, Userlytics, TryMyUI, Userfeel, TestingTime (for people outside the U.S), or Side Income Jobs.
Don't sacrifice morals for a quick buck — At the outset, you'll want to do all sorts of things to make money online, but don't sacrifice your morals for a quick buck. Not only will you put people off, but you'll lose Google's trust. You also shouldn't concern yourself with things like Adsense or other ads on a blog before you have around 100,000 visitors per day. Yes, per day. 
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