I've ordered some Lithops and Conophytum seeds and I'm hoping they'll arrive next week. In the mean time I've done a lot of research on their care and germination. I've found the links below to be very helpful. Both mention things that the other doesn't, so if you'd like to start some of your own definitely take a look at both. Here they are:
Lithops - Cultivation
They grow relatively slowly but I'm super excited! I ordered mixed varieties so I should get a lot of diversity in colouration and patterning.