First of all when I started quilting years ago I was told by a long time quilter that it's actually a good thing to have many quilts in various stages (except for the I hate it and won't touch it again stage). That way if you are bored sewing, go to cutting or quilting or planning etc. Besides we quilters know how easily it can be to get caught up in that new fabric & pattern so that we have to set aside the other one temporarily.
If it's the difficulty, The Disappearing 9Patch is great. Here's a link to another easy, but versatile block.
Good luck & happy quilting.
http://blocksnswaps.blogspot.com/sea...lock%20Pattern