Some fun ideas since I began learning Ruby:
1.) Crowdsourced code recycling for education
2.) A fun "tic-tac-toe *cubed*" logic game involving numerals that serves as the skeleton for a much more grandiose game.
3.) Colored alphabet app that serves as the skeleton for a much more grandiose app based on phonics.
4.) Guided meditation app
5.) Remote viewing app
6.) Next Level Memes
7.) AmateurPhilosopher.com
8.) Preparatory apps
9.) Program that renders visual representations of conditional pathways.
10.) Collage sprite
11. App that shows you how much code is any given program/website.
12. Lyric battle annotation game.
13. Ad-Cover