Kawaii nesting envelopes, Matryoshka-style

Based on the Snow Ball swap by @streetjewel and modified with her kind permission...

SO! Round 1 of 4!

Get yourself an envelope (the smallest the USPS will allow is 3.5X5), decorate it, and put a small surprise inside. Mail it to your partner. Rounds will be spaced a week apart.

Your partner will NOT open your adorable envelope, but will place it, and a flat surprise in a larger envelope, decorate the heck out of it and wait for round 2.

And so we will go for 4 rounds. At the end of which time you will receive, chain letter like, a pretty, large envelope full of special envelopes and nifty surprises!

Please do not join if you're unwilling to comment to all rounds. =D