Last year I picked up a few packs of the stuff with the intention to make casts of stuff. Together with a box of second hand legos these ended up in storage cabinet. Cause I had a free all I can do as I want pass tonight (both the wife and kids are out) I could take over the kitchen table with a box of Legos, a ton of bitz, Oyumaru and hot boiling water. Ain't that everymans dream? :D
A quick refresher course on Youtube later I was heating up moulds and I had built a Lego casting chamber (by lack of a better word):
An evening well spent, I say!
PS Oyumaru goes by many names and is sold in many colours but transparant ones make it easier to see if there are air bubbles trapped in your mould when you press the GS in. Simple tip!