TinyCards.com (from DuoLingo.com) is a great tool for creating flashcards. You can save the individual chords from UkuleleGo.com and paste them into the flashcard maker. Here is an example I created.
Ukulele Chord Cubes would be great to use like dice or something like that. Here are some sold by Ukulele Magazine.
![Ukulele Chord Cubes from UkuleleMagazine.com](https://cdn.shopify.com/s/files/1/0397/8489/products/Chord_Cubes_NEW_3_of_9_1024x1024.jpg?v=1493059846)