I also tried that, but it came out wrong :/ I do think that I got it down now. Let me take you through how these came to be...
First of all, I needed my 'hero shots' and came up with these six.

After I removed their useless lightsabers and retouched them, I needed some nice backgrounds.

Not quite happy with IV not being in the same style as the others, I then had to try something different. I also had to remove parts of Yoda and Luke's legs in the background of V.

Now I added some new lightsabers and fixed the back of V by coloring and cloning out Luke's legs and parts of Yoda. I did some
Lucasing and edited out the two suns on the back of VI. Also did a new background for IV, by taking the shot of Luke watching out on the horizon and contract it. I used this nice shot:

Now, for the final part, I needed to install the TT I wanted to use along with my movie titles.

With the last part, I added some of the characters surrounding colors on themselves, to make it appear as if they were really standing there, and cut out from elsewhere.
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So, when I realized that all character shots of Luke for V and VI were useless, I had to create my own.
For V I used the Dagobah shot and added another head.

VI is whole other story. No character shots were of useful quality, so I did what I didn't wanna do, but it turned out very nice. I used an action figure and added a headshot of Luke.

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Now I really feel I created something new for Star Wars. And now on to the backs!
All covers created with Photoshop 7. Old school, baby!