Life's too short to work on something I don't love.
If it's something that just hasn't percolated long enough for me to know how I want to finish it, I'll put it aside, but if it's something that I just plain don't care for, I'll pack it up and send it to the Goodwill. Or, in the case of one half-finished collage I just tossed the whole thing in the garbage. Made me feel a whole lot better after struggling with it for weeks.
Working on something that doesn't make me happy can cause me to avoid my sewing room altogether and I don't want that.
Watson