Displaying plots in rectangles

The easiest way to do what you are asking is to display your images in a rectangle.  This is covered in 2.9.6 of the HelpBrowser.  Here I have taken two plots and put them im rectangle centered on the points {2 Cos[t], 2 Sin[t]} and {2 Cos[t + Pi] ,2 Sin[t + Pi]}.  I have included the two circles to help visually define the paths.y

p3 = Plot3D[Sin[x] Exp[y], {x, -5, 5}, {y, -2, 2}]

p2 = 
      DensityPlot[Sin[x] Exp[y], {x, -5, 5}, {y, -2, 2}, 
        PlotPoints  ->  40, Mesh  ->  False]

Table[
      Show[Graphics[{Circle[{0, 0}, 3], Circle[{0, 0}, 1], 
            Rectangle[{-5/8, -5/8} +  {2 Cos[t ], 
                  2 Sin[t]}, {5/8, 5/8} +  {2 Cos[t], 2 Sin[t]}, p3], 
            Rectangle[{-5/8, -5/8} +  {2 Cos[t  +  Pi], 
                  2 Sin[t +  Pi]}, {5/8, 5/8} +  {2 Cos[t +  Pi], 
                  2 Sin[t +  Pi]}, p2]}], 
        PlotRange  ->  {{-3, 3}, {-3, 3}}, 
        AspectRatio  ->  Automatic, ImageSize  ->  540], {t, 0, 
        2 Pi - Pi/12, Pi/12}]