The house ATCs have now been sent out so I can post up my version.
The background is radiant rain sprayed onto textured black paper. The house is a sprayed paper stamped and with a sprayed piece of book paper added. The words are dymo tape.
The previous month's theme was Springtime Promises and here is the ATC for this theme.
I created the effect using masking. I used a flower mask and sponged some colours over it then put a bird mask over that and sponged on more colour. The little piece added in the corner is made from a textured piece I made in this blog post and punched out.