Hi Heribertom,
Yes, using icons instead of buttons is not a problem.
Every object in MVD is 'clickable' so you can place pictures, labels etc on your form and then write a bit of script to instruct it what to do when the object is clicked.
Please look at the attachment.
In the example, I use icons which, when clicked, click an associated hidden button. And to make it look more 'interactive', I 'nudge' the icon when it's clicked.
I also use a label ('?') which changes color when you hover over it and which 'nudges' when it's clicked.
However, with regard to changing color of an icon, you would need to use 2 identical icons (for example, 1 blue and 1 red) and switch them when they are hovered over - you can't actually change the color of the icon itself.
Anyway, I hope this gives you some ideas.
Derek.