3M makes some 1/2" trim tape that works real good in covering up the window trim and the wheelwell trim, thats what ive done. painting would ultimately be better, but im not out to win any car shows so it looks good enough for me. electrical tape might work, but isnt quite as weather durable and will turn to goo if it gets hot.
if you like the look of the impala grille, that bolts on easily. for the price i think it really changes the look of the car. i used some red reflective tape to cover up the bowtie on the grill, and also did this to the trunk bowtie.
taking off the caprice badging on the trunk is easy, but sometimes the glue behind it hardens up pretty bad and is a b!tch to get off. a hairdryer helps a ton.
you can remove the side trim by just heating it up and pulling it off.
you can also paint the chrome trim around the tail lights and the chrome doorhandles too. etching primer is needed but should work nicely