how do i zoom in and out in the sprite editor paint editor
wouldn't CTRL+wheel work?
Nope, we don't have that capability. Sorry about that 
Oh. I was trying to make a fractal
You can make it with pen, and save it as a costume.
edit: heres the block for it. first, draw it with pen, then use this block: 
There is a zoom function in SNAP! which I use a lot in clubs and class for digital OHP. Its fairly easy to change the size of block on screen i.e ZOOM BLOCKS to 1.4 and 2.0 + etc. I use that when I am making a detail 'Screen grab' or just to make it easier to read. Don't forget you can also enlarge via the browser by using the command + (+) and (-) keys which are very handy (Mac is 'command' and Windows is 'control' same in Linux I think (using CHROME in Linux at the moment). Using all three MAC/WINDOWS and LINUX (all distro's I suspect, I am on ZORIN (or DEBIAN or UBUNTU mate or MAC) I have usually found a way to enlarge screen with a keyboard command. Not just SNAP! but anything I am using. Hopefully this is useful to some of us. I shall be using that technique this afternoon in class although on the dreaded WINDOWS.
I meant the costume editor