I was thinking something similar, I wanted to take some cassava with me, but I cant because I'm not heading straighth home; I'll be going to Bangkok for 14 days and then to Kathmandu for a month, and the only thing I'll take with me are spices, which also isn't bad :)
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Wow, you're jet-setting, huh! Well, the orchids may not last if you get from there so yes, better the spices. Maybe there are orchids in Kathmandu. Or wait, they say Nepal has many marble stones, even the beautifully colored ones. I think that will be a better souvenir too.