Hey, I have replaced my grilles completely in my 94 SSEi. Here are some pictures. Click on them for bigger images.
That third pic shows off really nicely the dice and air fresheners!
I took generic wire cutters and tore out the grille. Then, because I didn't want to use glue, I drilled holes in the housing. I bought an aftermarket grille sheet that'* pretty big, and you can just cut from it what you want. Then, I used blue cable zip ties to put on the grille. With Wal Mart "touchup" paint that goes on like nail polish, I painted the cable ties. In those pictures, it was not all finished yet, but I've spent some time flexing the grille and readjusting the ties, and now it'* even.
Well, you can avoid the adjustment hassle by getting some "Quik" JB Weld to put the grille on there. The issue I had with this is that I didn't want to deal with JB Weld and plastic from 94. I figured it would just eat away at it a bit more quickly than expected.
This might not explain everything, but I can take some more pictures (once I find my camera), and with this I've subscribed to the thread, so just ask away.