I can understand you not wanting colours similar to those you've had before, because what you actually miss more than anything is their funny liittle ways and to have a cat the same colour who is in no way similar, temperament or character wise, to any you've lost, can be difficult to accept.
When I lost Suzie a blue-cream colourpoint, to CRF last year, I DID think I wanted another cat who looked just like her - but of course what I really wanted was my beloved Suzie back
I looked on several breeder's websites and found the one I eventually got my little Gwynnie from - I was drawn to that website because they have a picture of a breeding girl on it who is the absolute image of my Suzie (different colour - blue tabby point), the way she was sitting, looking down, the shape of her face, just so like her. I wanted to wait for a kitten from her - but then I thought about it - and knew that even if the kitten looked similar to Suzie - he or she would never be Suzie - so ended up having Gwynnie, a seal tabby point from a completely different set of parents!
Prior to me losing Suzie, I took on Jasper who is 13, his owner had died. Jasper had the same mum and dad as Suzie, and although he's a redpoint - he has so many similar characterisitcs to Suzie its scarey! and actually now I've lost Suzie, some of things he does reminds me so much of her - its bittersweet.