I find this piece in particular to be relevant to what I am basing my design from. As my chosen festival is a surfing and music festival, I think a use of watercolours would be an appropriate (and also relevant) choice for print making experimentation.
10 Wordless Videos that Teach Problem Solving -- Speech paths are seemingly always on the hunt for materials to address problem solving - did you ever consider videos? I found 10 wordless videos that are fun and make kids think about how to fix the main characters' problems!
Black Beauty: NCT's wild custom BMW R100
Black Beauty: A wild custom BMW R100 RT by NCT of Austria