Try to figure out what is holding you back because it might not be your perfectionism...is it lack of time, don't want to mess up the room, insecurity of what to do? If you decide it is perfectionism then instead of trying to make a whole quilt decide on a block you like and a color scheme you like and just make the block. Don't think of it as making a whole quilt...make just 1 block and DON'T tear anything out and start over! After the block is finished look at it and think about what you want to do differently on the next block and make a new one of the same block concentrating on "fixing" the errors. Keep doing this and not only will you be perfecting your work (which for us perfectionists is very necessary) you will also be building up your block pile. Before you know it your blocks will all be coming out nicely and you can decide if you want to put the first 1 in the quilt top with the other...my guess is if you have someone else lay out your blocks (without you nearby) and you walk in and stand 5 ft back from it you won't be able to pick out your 1st block from the others...you can do this!!!!!
Diannia