I got this idea when thinking how to teach GH. Actually there is a long history of playing spelling game(Scrabble) to stimulate our knowledge and ability of vocabulary. 

Card game is an another approach for brain exercise, such as IDEO method card for designers'  brain storming. So I think these methods will do for GH beginners.    

    It's about playing Grasshopper as a Klondike game on the computer, not playing a physical GH cards. The game is very simple, 2 or more players is fine. Start with one or few components by random choosing. The player can put component and extend the program on both sides of original body, but please add on other players' component. You can put only one or few components, but too much components may forms some frequent sequence.

    I and my friends finished a short Klondike under above rules with distance (Japan-Taiwan), and attach the result. We even made a short animation of parametric gradient.