/diy/ - Do It Yourself

Hey /diy/, I've got an idea to build an electric guitar with a "secret wood" body. You often see these types of designs on rings like in the pic related.
I was wondering how I could do some of the more "complex" patterns and designs like this snow storm or the aurora borealis posted below. I'd imagine it'd be something to do with mixing epoxy only partially but is that it? What type of epoxy(s) should I use for something as big as a guitar body? I've never worked with resin before so I'll definitely do some tests before I commit to anything big.