80's cartoon about blue boy elephant?

Hi,
I remember a watching a short cartoon series when I was young that had good theme music… it had a really bassy voice singing something like “…mummy’s got a blue boy now…”
The “boy” was a blue elephant. I was wondering if anyone knew the name of that show…
Thanks.

From here, and now that I read it, it does sound familiar!

Little Blue : An elephant who played with his Mum’s biro in the bath and got stained blue. The theme tune was classic but I can only remember bits.

LITTLE BLUE, LITTLE BLUE,
WHY DO THEY CALL HIM LITTLE BLUE?
PLAYED IN HIS BATH LIKE SOME OF US DO,
HE BIT HIS MUMMY’S FOUNTAIN PEN AND BROKE IT IN TWO,
THE INK IT SQUIRTED IN THE WATER WOW.
MUMMY’S GOT A BLUE BOY NOW.