My base panel started with an old page of sheet music. My tip to you when you are making your own background design is to start with a piece larger than you will need. This gives you some wiggle room when your are adding textures.
It's a fall card, so I grabbed the orange ink and a sponge and just added some color at random. Then I sponged on some red bricks using a stencil.
The collage image is mounted on cardstock and attached with foam squares so that the card isn't just flat. I added a few paper flowers and some Dew Drops in the same basic color scheme as the background. There is still plenty of space to add a sentiment later...or not.
Sheet music paper, cut to size
Come back again and see what other projects the Altered Pages Design Team has to share with you!