I see. Maybe some Euler problems? There used to be a good site called rubyquiz.com that had nice exercises that were less math-like, and that (mostly) worked well in multiple languages. Rosetta Code might be another such place. Or just think up your own.

There are two issues as I see it. One is to be able to code something that seems to solve your problem. The other is being able to code with reasonable surety that you haven't committed some subtle error that will bite you if you actually deploy the code. You need deeper fluency for the latter than for the former.