Have you ever visited
The Garage Journal You might come across some good ideas there.
Although since plans are to sell the house, personally I wouldn't put much effort/money into it. I would think that getting it as clean as possible would be best.
I say this from the buyer standpoint as well. What if the interested buyer wants to use the space for a full on workshop area and you have a rubber mat or plastic tile installed? That's not going to mix well if he wants to weld in the garage so most likely he'll rip it out. You've wasted your time and money.
I thought about doing the epoxy such as the Rustoleum kit bought at Home Depot and decided against it. I found out that the floor should be grinded down first if tire dressing was ever in contact with it so I scratched the idea. Not only messy but it would have been very time consuming.
Spend your time on gargejournal to get some awesome ideas for the new garage
