What a great project, really nice! I like your guinea pig envelope a lot! :)
Oooh - I hate to be a kill joy but your seeds are likely to be seized by Aussie customs who won't let any plant matter into the country. Just a thought before you send it so she gets the pleasure of opening an unharmed envelope. LOVELY IDEA though!
Maybe I will make some cardboard ones! I did think that might be the case Ange x