Actually, yeah. I mentioned changing your daily routine earlier, and when Barbizzle mentioned it, I remembered something:

Usually, I have pretty boring dreams, but when I went on holiday last year I noticed that they got much more interesting and memorable. I really think that a repetitive daily routine contributes to boring dreams. Be more spontaneous: change the tiem you get up and go to bed; go for walks and visit places that you've never been before; spend time on creative pursuits like painting, drawing, or writing. Just do whatever seems like fun.

I kind of agree with Alric too - it might just be that you don't remember your interesting dreams, but it seems a little unlikely that you would remember all the boring dreams, but not the more memorable and exicitng ones.