I know how to make an all one color background but I don't know how to make a good background. Halp
maybe u can do 2 texts and put a diffrent color in them
Depending on what your topic is search up background and you can get a lot of inspiration.
maybe you can do an emoji background. Get a text object and put which emoji you want as your background in the text. Then do add a new rule, go to looks and sounds and look for the grow by block, finally put grow by 5000. (by the way if you want you can make the emoji background smaller my changing the number 5000 to something smaller like 4000 or 3000)