My "dream garage" would have either black and white checked (2' sq) tile pattern, OR, have a local spray-on bed liner outfit spray the floor. (I have an 'in-law' that has a bed liner biz and he does quite a few spray-on floors. He does any color you want, or even can do patterns, logos, etc, all done in the material. Looks beautiful!!
Other than that, I like the deep sink idea. Course being that it is -4º outside as I type this, LOTs of insulation would be a consideration here in Chicagoland! (Central heating and air (aka climate control) would be a must!)
LOTz of lighting!!! One thing that makes me nutz is a dimly lit workshop.
Oh...Make it a little bigger. (I might wanna bring our two Vettes over to visit; a '69 vert L46/M4 pearl white, and my flame red '90 Z.)
I'm jealous!
P.