You can try watching this video for the xenia.
Xenia Fragging Video - Podcast Episode 29
That was the first fragging lesson i got and I've been using the same technique for some time. For the mushrooms i would try placing them on the rock and then simply place a rubber band loose over the mushrooms. Or you can use zip ties too. In a week they should attach. However make sure the rubber band or zip tie is loose enough where it wont split the mushrooms but tight enough to hold it.
