A sort of tie-dye butterfly design. :)
I set out to replicate the brilliant t-shirt worn by Nick Mason on Pink Floyd Live at Pompeii (which you should go and watch if you haven’t already!).
I did some snooping around and it looks like it may have been a homage to the band Iron Butterfly. Using their logo as inspiration, I tried replicating Nick’s shirt but ended up putting my own spin on the design; hopefully you like it!