ORIGINAL: CCRC1
For me its easy, clean the shop. I don't mean just move stuff around but really put everything in its place, clean off the building board completely, shop vac everything and throw away all the trash. A spic and span shop with everything in its place is a big motivator for me to build something, anything!
Bingo! Nothing is more depressing that 3-4 projects sitting around in the way of each other not getting finished! Put all the tools away, pack away the projects that will take the longest and voila!, one easily digestible project with plenty of room to work on it.