Answer
Sure you can make anything if you get a soldering iron and some solder!
if you live in england try maplins stores or find the equivalent in your country
maplins have got mini projects to get you started, or amp modules you could wire into anything.
check out http://www.maplin.co.uk/sub_category.aspx?menu=10&doy=11m5
and click on the projects section, the "pre-assembled audio" link etc,
browse and see what is
right for you
