Blueish rabbits escaped from a french musical for children called "Emilie Jolie" (written by Philipe Chatel in 1979)

My rabbits are not plainly blue they only have blue reflection...

In this play, there is really blue rabbits who belong to "the blue rabbits company". They have stretched out ears and mischievous eyes. Their favorite river is the "Danube" but they have an insoluble problem: they become red all over when they get a cold...and then, return to blue color when the sun shine...

Emilie really cared for those blue rabbits!!!