Simple game ideas for learning purposes?

I just finished building a little HTML5 2D engine using Google’s Dart language (might port it to pure js at some point but I hate js, so maybe not). I’m trying to teach myself game development, but I’m more of a coder than a game designer.

Anyone have any ideas on simple little games I can try and code to cut my teeth on, as it were?

Keep in mind that my artistic talent barely goes above the following artistic masterpieces:
:slight_smile: :wink: :stuck_out_tongue: <3
So I’m looking for stuff I can implement in an abstract way, or with artwork I can easily find through a google image search (this will be for my own edification, not to actually distribute).

Dominos, card games? The algorythms for “how the game works” are predefined and they’re 2D games.

Blackjack and tic tac toe.