Happy Mail Club by SJ Nielsen

Artist SJ Nielsen fills each monthly envelope with a collectible 4x6 art postcard of her watercolour work, a club-only sticker, a soft-touch bookmark and a behind-the-scenes letter about her process. Some months add small extras such as paint swatch cards, mini prints or a calendar page, and every design is made just for members.

The club is USD 11 a month in the US and USD 13 for international members. Mail goes out once a month at the start of the month with a single stamp, so there is no tracking; join any time and you start with the next batch. Prepaid 6 and 12 month gift memberships are also offered, and past months are sold as catch-up envelopes.

For watercolour fans and anyone who likes a calm landscape on the fridge.