Hello XXXXXXXX,
Welcome to Just Answer.
Sorry to hear about your problem.
There are no rules when it comes to painting; you can do whatever you want. The good thing about paint, is if you do not like the results, just repaint it.
The key to color is to draw the eye to a particular area, such as if you are trying to accent a wall. Color is also used to define space and create mood, and often works well when the room is all the same color, while the room next to it can be a separate color. If you would like 2 spaces to feel like one, than painting them the same color can achieve this. As far as mood, dark colors can make spaces feel smaller and "heavier", while lighter colors can make spaces feel larger and lighter and brighter. Blue family tones make a space feel cooler and red and brown family tones feel warmer.
With your dark green tiles, I would try complimentary colors such as chocolate browns or maroon/ wine colors. Try and compliment your cabinet colors or counter tops, but not match the colors exactly. This can help tie everything together, even if it is subtle. Knickknacks, paintings, display objects in the kitchen can even start to work with these wall colors; things will start to "pop". Do not be afraid to make a sample board with all of the paint chips, tile samples, grout samples, counter samples, cabinet sample, etc. to start seeing how they all the colors look together and how they play off each other.
If you need further help or clarification on this answer, please do not hesitate to reply to this post.
Thanks for asking your question at Just Answer.
Best of Luck, Brian
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Architect
Licensed Architect- 12 years, L.E.E.D. AP, Former Remodeling Contractor- 10 years