Exactly my thinking. When I saw Vanillite, I thought they ran out of ideas at the moment they created it. It seems too... I don't know, easy to create. When you look at Pokemon like Drowzee, I seriously doubt any ordinary person could make THAT out of an aardvark. They used to be so creative and used creatures, mythical or real, to start, then went crazy with it's abilities and differentiations from that original creature. With Vanillite and, like you said, Litwick, they seem to have just picked up an object and drew a face on it.
Yeah the Pokemon seem a bit generic now. I like the throwbacks to mythos in Japan like Whiscash and the belief that catfish created earthquakes under Japan which is prevelant in Zelda lore as well in A Link to the Past. This is kinda true with Thundurus, Landorus, and Tornadus, but their sprites are almost identical it's laughable. I always confuse them and they all look pretty much the same. They could have at least had different poses, or looked less like clones of one another.