Coincidentally I received a chaincard back home yesterday. The card started its journey on 19 November 2018, and after traveling from the Netherlands to Germany, Hungary, China and Taiwan, it came back full of nice stamps.
As the theme was 'Furnitures', there appeared to be some matching stamps: chairs!

The front side of the card is matching, too! It shows contemporary art by Bill Viola, a video still titled 'Catherine's Room (panel 3)' (2001).

On some of the cards of my chaincard pals I didn't stick the same stamp shown on my card bottom right, but an other stamp from the Children's Stamps 2015 serie, showing a couch:

This time the words in Dutch don't start with a 'C':
chair = stoel
couch = bank (the 'a' pronounced as the 'a' in 'harvest' or 'calm')
coincidentally = toevallig
contemporary art = moderne kunst
card = kaart
chain = ketting
children's stamps = kinderpostzegels
See more stamps on the theme 'the letter C' at today's Sunday Stamps, and don't forget to check the links in the comments to that post!