Tin foil seems the logical guess but since everyone seems to be thinking that's what it is, I'm thinking that's too easy! So what else would crinkle like this- I'd be tempted to say another kind of paper but again it just seems too easy. So my thought is that since it's a macro, maybe it's some type of faux leather- like a wallet or coin purse. Notice, I say faux as I know you would not have the real thing! Of course, I'm sure I'm wrong but it was a fun stretch of the imagination!
Excellent abstract, Alia. I can't even fathom a guess. It's quite shiny but I do agree with Ann that tinfoil is too easy. I can't wait to see what it is!