There were cactus seeds available in the garden shops sometimes. One package with picture of blooming gymnocalyciums on it especially attracked my attention, then I was given more seeds of different varieties. I sowed them all. There was still frosty outside to get a bit of sand to be added into compost at that march. But my fingers itched, I used peat based compost and seeds were easy varieties, so there were no problems with them to spring.
It was so interesting to watch them changing from berry-looking seedlings into differently shaped hedgehogs! Many of them got new homes. No one seedling was lost.
These are my already 2 years old youngsters:
Astrophytum crassipinoides x5
Astrophytum myriostigma x4
Echinocactus parryi x4
Mammillaria candida x3