In 2006, Ríos and Michael Franti contributed their voices to a project by Flip Kowlier, which involved a cover of the song What's This? from the stop-motion movie The Nightmare Before Christmas by Tim Burton.
Geike has also sung as a guest vocalist for various artists such as Ozark Henry, Flip Kowlier and Tom Helsen.
Flip Wilson | Flip Saunders | Flip Kowlier | Flip Flap Railway | The Flip Wilson Show | Lil' Flip | Flip-flops | Flip | Flip This House | flip-flops | FLIP | The Flip Squad | Phil "Flip" Boggs | Flip This House (TV series) | Flip the Frog | Flip That House | Flip'n Sync | Flip clock | 'flip clock' | flip book | flip | Andrew "Flip" Filipowski |
Paul Michiels went solo performing the same soulful, Motown-sounding music that made SoulSister a success, while Jan Leyers joined with Filip Cauwelier and Joost Van den Broek to play rock in the band My Velma (named after a character in the Raymond Chandler novel Farewell, My Lovely).