These circles can be changed fairly easily (I hope!) for font, colour, size and change the outer line to solid dashed or spotted. You can move them by clicking and dragging them with your mouse.

Text - Font & colour changes
Place your mouse over the text on one of the images and click - this will bring up the text box.  You can now change the text and the font as a normal word dcument.  If you make the box bigger than the inner circle it will blank out some of the lines.

You can click around on the word art toolbar and see what happens, just makes sure you save your work every now and again before clicking - or click undo!

Line - appearance & colour changes
Place your mouse over the line on one of the images and double click, now right click --> format auto shape-->colors and lines tab - you should see the colour selected and the line type - you can change these using the drop down boxes, and also the weight of the line.

You can click around on the word art toolbar and see what happens, just make sure you save your work every now and again before clicking - or click undo!

Change size of whole thing
Place your mouse over one of the images and click one, then right click --> Format object ---> size tab then change the height and width to your desired size.

Finally if you don't have MS Word I have just tested them on Open Office which is free to download from SunSystems and they work fine on there too.  Instead of WordArt it is called Fontwork and is in the drawing toolbar.

I hope that you have some fun with these - I can add a few more with more lines etc LMK if you find them useful.