Well, to make it appropriately Busse Ugly (BUgly?) with paint splatters, drools, & drips, you'll want a surface with enough tooth to hold the paint. I've never tried painting crinkle coat, but it may take paint in its natural state.
If not, my guesses in this direction are:
- lightly sand the crinkle coat with sandpaper
- try using a bit of MEK (methyl-ethyl-ketone) from a home center or paint store to see if it will break up the surface of crinkle coat enough for paint to grab hold
- put on a coat or two of primer to give the paint a good surface to hang onto
- scratch up the crinkle coat surface with some vigorous "tough love" like digging in sand & rocks, doing a bunch of fencing & demolition jobs, or prying at brick/stonework with the blade (this is the most fun option

)
- all of the above
Then go wild with taping, leaf pattern masking, & airbrush painting the blade in your favorite camo colors.
"Or other colors," says the psychedelic tie-die fan in the corner.
