The "Sky's the Limit" mural on the side of the Sand Dollar Thrift Store isn't there just to beautify the shop's exterior -- it's also there to remind the hundreds of kids who walk past it every day on their way to school that there's no limit to their potential. Coordinated by Reginald Adams, co founder of ArtworkZ, and sponsored by Keep Houston Beautiful and DiverseWorks, the Dal?-style mural shows a typical neighborhood street scene. Typical, that is, except for the four giant heads floating in the clouds. Thirteen students from nearby Jefferson Davis High School helped plan and paint the mural.