This idea was a bit of an experiment following on from an idea I had after being asked to review Chalkola Premium Wet Wipe Markers at the end of November.
The idea was to make an interchangeable display of children’s artwork/drawings, using the Chalkola pens on inexpensive chalkboards, so off I trolled to Poundland and found exactly what I was looking for http://www.poundland.co.uk/chalk-board-29-x-21-cm.
The framed board measures 29cm x 21cm. The chalkboard surface appears to be a coated mdf (but I could be wrong), but, the whole thing weighs very little, which I hoped that the self adhesive magnet discs I planned to use on the back would support. 
Once the pens were “activated” by a little shaking and then gently pressing the nibs up and down on a spare piece of paper several times, the chalk ink flowed easily and my able assistant, Iris, could get on with the task in hand, to wit creating a wonderful, colourful masterpiece.
I have to admit that I am VERY, VERY, VERY careful when arming Miss Iris with any felt pen, but with these chalk pens I really can relax, as any stray scribble can be removed easily with a wet wipe (although I did still put a mat under the board just in case), and no inky stained fingers for Iris either, again, a wet wipe is all you need.
With all colours used and Madam happy with her work and a the board was turned over and self adhesive magnet discs evenly placed round the edges of the frame.
Et voila, it held to the side of my fridge freezer like a dream (see first picture)
Now I know that my idea worked, I shall be buying a few more chalkboards and looking for some similar framed whiteboards (as the chalk pens will also work on them too) to create a mini art display. Boards can be displayed in all sorts of portrait/landscape combinations and when the chalk fades or a change is needed, they can all be wiped clean with minimum effort, ready to create a totally new series of pictures.