Here's a little project to make these nice mini-cards out of fabric scraps, using machine embroidery and bits and bobs. This is very photo-intensive so be warned.

You will need:
A4 piece of card, coloured if you wish
Scraps of fabric
Sewing machine and matching/contrasting thread
Metal ruler, pencil, scalpel/craft knife, cutting board, scissors

Woops, wrong way round. Start by cutting a 9cm wide strip that's the same width as the short side of the A4.

Make two scored lines in the piece, the first 9cm from the left edge, then another 9cm in from that. You should have a 'tab' on the right which is approximately 3cm.

Fold your card with the tab on the outside (see photo below) and if the tab doesn't quite fit over the card when folded, trim the main part of the card to fit. It should look like the one below when folded.

This is how the card without fabric or anything should look. Now to cut out the window!

Mark an 8cm square on the inside of the card, on the panel next to the tab (as in the photo). Use pencil and do it liiiightly.

Cut out the window using a sharp scalpel and ruler on your cutting mat. Now set that aside. Lovely.

Choose your fabric. I used some powerful 1970s curtain fabric and this strange quilted type thing. Pick two fabrics to start with.

Using your cut out window as a template, draw round this and cut out a square in each fabric slightly larger than the window so you can glue it down on the base of the card.

Do this for both fabrics and you will have something like this.

Now, stitch the two fabrics together, one on top of the other, using a straight stitch, around the edge of the square with a 0.5cm seam allowance. You will be cutting through the top fabric to reveal the layer beneath so decide which one you would like to see more of. It's like a fun boy game. Aha.

Do some stitching experimentation on your square, using the different stitch settings your machine has, creating areas and blocks on the fabric for later.

Choose one or two areas which you want to cut out. Go round these areas with a small, tight zig-zag stitch to prevent edges from fraying.

After that, cut out the top fabric layer using sharp scissors (be careful not to cut through both layers) to reveal the magic beneath. WoooOooOooOOOooo. Looks quite cool.

Add on some other bits and bobs if you fancy. I am currently enjoying ric-rac but this may fade soon.

When you've completed your fabric square, line up the fabric under the window in your card to make sure it's straight. If you need to trim the square to fit in, go ahead.

Using Pritt stick or other glue which works (superglue is shit), glue the fabric down to the other square panel of the card.

Check that the window fits over and put glue around the window side which faces the fabric. Glue down securely.
You have finished your card! Place on table and expect admirers.
PS The only two things that got me through that bastard post were 1) BBC Radio 6, you genius people! and 2) chocolate cake.