One of the best ways to use up those little odds and ends is to make cards. You can combine all sorts of scraps and make great backgrounds. Here's a few Halloween cards I put together.
I had quite a few square-shaped pieces left over from projects. I grabbed a A6 flat card and the Best Glue Ever and randomly adhered squares all over the front. After trimming the edges, I filled in a couple of holes with tissue tape and adhered it to a larger sheet of leftover paper.
I used a large sticker as my sentiment. But I didn't want for it to get lost in the background, so I used foam squares to raise it up. First, I pounced the back of the sticker with the Perfect Crafting Pouch to deactivate the sticker.
And here's another option for all those random sized strips. I grabbed another A6 flat card and the Best Glue Ever and placed thin lines all over the top of the base.
Then, I was free to add my strips randomly over the top of the base. I didn't worry about pieces hanging over the edge. You can see what it looked like at this stage - before trimming. Once I was done adding my strips, I turned the card over and trimmed around the base.
The next step was to frame the base with some orange patterned paper and a black card base. A bit of ribbon and a tag from the same Echo Park paper line is all this needs.