I think this design is often called "Sand and Sea".
It's basically developed from the original Michael Harris design bubbly yellow background with a band of Eric Dobson's "Tiger" design around it's middle.
The "Tigery" bit, to me at any rate, seems to be in the more vibrant earlier colours - I believe as time went by, the bright yellows became a lighter, more creamy coloured and flatter texture, and the browns had less red in them - also the overall appearance of the colours have less depth.
I don't think this is anything to do with it being bigger pieces getting flatter as they are stretched into shape, as the flat design appears on a lot of smaller pieces.
I seem to see two clearly distinct types of Tiger.