Coulomb is actually made from a number of elements adapted from other patterns.
His body is a simple sphere, based on a draught-excluder pattern, using Sirdar's funky fur yarn. It took a while to find blue fur yarn - coulombs are blue and fluffy, as we all know, so it had to be done. Obviously, the colour is now discontinued, as is always the case <sigh>. But there is a blue in Sirdar's Funky Fox.
So the secret of Coulomb is that, instead of reinventing the wheel, I took bits of other patterns and adapted them to my needs (rather like Object Oriented Programming - oh yes, I have now linked knitting to computer programming!!).