Well if it's just a cheapy little 30-60 watt amp, then there isn't a whole lot you can do. Sometimes when you get the bigger amps, and usually higher quality comes with the higher wattage amps, you can mod the reverb boxes a bit. As far as the guitar? Get a high quality cable for it, trust me it's worth the investment, cheapy cables ALWAYS come apart at the connectors. You could paint the guitar itself if you have any artistic skill. Stencil and spray paint even?