As I believe you are asking about graphics (as in bitmap images rather than graphs, as in data), PHV has the best suggestion. Unless I am wrong, and you really are talking about graphs.
Record a macro to insert a graphic.
Take a good look at the code. If you have problems with this, post back here.
You can add any macro to any toolbar, as a button. Type in "add a macro button to a toolbar" in Help. It seems a bit daunting at first, but actually it is easy. If you have real problems, post back here.
You can also add macros to menus. You could add a "Insert Graphic" menu to a toolbar, and under that menu have a dropdown list of all the graphics you want to insert. Each menu items would fire a macro that would insert the graphic.
What you are asking for is not difficult. Try recording one macro, dragging it up as a button to a toolbar, or putting it as a menu item - just to see how it works.
Again, if you have a specific difficulty, post back.
Gerry