I love cacti that have evolved into rock like specimens, why collect rocks when you can collect living rocks right? They will also teach you many valuable lessons like patience and determination. You could also try eating a peyote like the native american tribes. They see the lophophora as a sacred teacher, it is believed to be one of the oldest types of cacti.
Below is a lophophora williamsii var. huizache from my collection. I hope you enjoy my photos
They include Turbinicarpus, Ariocarpus, Lophophora (peyote), pelecyaphora, strombocactus and astrophytums. that's just to name the ones I have collected and will be showing in this post.
BELOW: Turbinicarpus Valdezianus. Grew from birth with two heads.
BELOW: Pelecyaphora Aselliformis
BELOW: Astrophytum Myriostigma 'fukuryu'
BELOW: Strombocactus Disciformis
BELOW: Ariocarpus Kotschoubeyanus 'Elephantidens'
Thank you for looking. I'll be doing more detailed posts about each individual genus.