You can add more than just text to a table. You can insert a graphic into a table cell just as you do in the body of your document with the Insert Picture function.
When you place a picture into a table using Insert Picture, the picture is formatted to be In Line with Text. This setting causes your picture to act just like a text character — you can format it by using font and paragraph formatting, and it will sit securely in your table cell.
You can also paste a picture from another program, but when you do, the picture may not be formatted to be In Line with Text. It's easy to change this layout option: just select the graphic, select Position from the Format tab, and click In Line with Text.