Making Background with Tiles

At studio of the imagemagic 

In the format slot choose granite and in the meta type any letter (this will be the file name).

You will create granite background of size 128x128.

Go to annotate. From the font list choose dingbat you like. In this example I chose three rowes of Davy other dingbats ‘ddd’. The default fill color is white, I used black. Then press annotate. Now go to decorate. In the decoration geometry slot, type in 5x5, click raise,and then decorate. Your tile ready. Save it for next step.
Your tile should look like this

Granite Tile

At imagemagick studio, in size slot input the 256x256 (2 x 128), and in the meta,type any color 

you want. 

Press view.

Go to composite and upload the tile you just have made. Check tile across and down the image 

canvas. You tile background is ready. Press output and save it as jpeg format.

Here are the examples

Squared  Tile Background