I Monster released two very different versions of the song. The first, which was included on their first album, the 1998 These Are Our Children, does not sample "Daydream"(a song recorded in 1968 by the Belgian band Wallace Collection), but instead has newly-recorded vocals and instrumentation, as well as new lyrics that begin, "I dream a dirty dream of you, baby".

The second version of "Daydream in Blue" was originally released as a single in 2001, then included on their 2003 album Neveroddoreven. This version is a remix of the Gunter Kallmann Choir recording, and the added vocals are processed through a vocoder.

The 2001 "Daydream in Blue" was sampled on the 2006 Lupe Fiasco/Jill Scott song "Daydreamin'". While a popular AT&T commercial is often said to use the I Monster version, it is actually the Lupe Fiasco/Jill Scott version.