This one's not from the shoebox and the design isn't as good, but it's a nice sentiment.
And here are some roses, to be cliche, but it turns out that New Zealand has issued some cool rose stamps (at least before 2001), including the rest from this series.
originally issued 1975 New Zealand (not sure when mine are from)
And lastly here's a heart stamp which is a little odd since it's for International Youth Year (a United Nations program in 1985), especially compared to the ones from other countries. I guess back then neon and denim equaled youth. Oh, Canada.