[Update summer 2012: post obsolete.]
If you have an Etsy shop, you can display clickable thumbnails of items from your shop (or your favorites) in your sidebar.
The code you can get from Etsy isn’t directly allowed in wp.com blogs. But you can convert it into a different, allowed, code (to which I have introduced a couple of improvements as well).
Copy your id number and your username (from the spots highlighted in bright red above).
[Update: the greyed part no longer applies – check the August 12 to August 18 series of comments below.]
Copy the following code model:
Replace NUMBER and NAME with your actual ID number and username. [Update: Don’t use the number given in the new Etsy code; select View Source from the view menu of your browser and search for “user_id”.]
Replace C with the number of columns you want, and both instances of W with the corresponding width number:
C=1 ⇒ W=89
C=2 ⇒ W=184
C=3 ⇒ W=279
To determine what’s best for your blog, check my post on sidebar width.
Replace R with the number of rows you want (can be 1 to 5), and H with the corresponding height number:
R=1 ⇒ H=89
R=2 ⇒ H=184
R=3 ⇒ H=279
R=4 ⇒ H=374
R=5 ⇒ H=469
If you wish to display items from your favorites instead of your shop, replace “shop” with “favorites“.
Paste end result in a Text widget (Appearance>Widgets: drag Text widget to Sidebar, paste code, click Save).
height:12px; creates some space between the thumbnails and the widget title above them; you can change the number to adjust it.
margin-top:-14px; controls the space between the thumbnails and the link below them (and this space differs from theme to theme); change the number to adjust it.
For a centered instead of a left-aligned set of thumbnails, you can use this variant:
In this case the space between the thumbnails and the widget title above them is controlled by the margin-top number in the first line of the code. Depending on the theme, you may also need to change the margin-left number to fine tune the centering.