- strip it and refin - if the wood grain looks nice, add a nice oil finish or some sort of clear lacquer finish, otherwise have it painted something unordinary (I like the Seafoam green example here, not my bag, but nice to look at on someone else's bass). Metallic black with a white pearloid pickguard (and good luck with that paint job)!! - $300-500 I guess plus a lot of time and patience - most dramatic change
- add a J pickup and all new pots; I think there is a Dimarzio PJ set that is supposed to be well balanced, and the pots with wiring harness (including a phase switch) can be bought at Bayou Cables, Stewmac, etc. - $200 or less, if you buy used
- Bad Ass II or Gotoh bridge - $75 or less if you buy used
- new tuners!! shop around, regular fender tuners do not fit my Squier, the holes in the headstock are offset so the backs of the tuners do not sit beside each other well on the back of the headstock - try something with a small footprint, like the Gotoh tuners - $100 I'd guess or less if you buy used
- new strings, something you don't usuallyuse but have wanted to try out for a while. I find adding new/different strings is an often overlooked mod that is cheap to do and can *totally* bring new life to an old bass. - $17-75, depending on brand
- defret - no idea what it would cost or how hard it is to do yourself, but you can maybe find a used fretless neck somewhere and just use it instead. I wouldn't touch this mod with a 30' pole personally