regarding the project in which you've lost interest...
I had such a project. I put it down for over a year (maybe it was three). But it kept gnawing at me all that time. I'd made some errors that were a bear to deal with. (Search board for "Lonestar gone wrong" for the story and photos.) I practically hated the quilt-- it was so frustrating for me. But I hated more that it was unfinished. I wanted it done more than I wanted to stop working on it.
If that's you, just push your way through it. You'll be glad to have it completed and behind you.
If that's not you, and you've really lost heart in it and know you're not going to finish it, consider selling it here as is; perhaps someone else will fall in love with it an take it off your hands.