Prop, the easiest projector swap would be the EvoXR - it bolts right in - Doing just a clear lens swap will only give you a bit more sharpness and color flicker at the cutoff - The EvoXR has a similar output to your factory E55 bi-xenon projectors just more intense because of the chromed bowl and clear lens, you would be happy with them for $150.

I know you wanted to try the Euro corners look for a long time, I saw a thread where a guy had his amber turn signal portion wrapped in brushed aluminum vinyl, it actually looked 95% of the look of the Euro facelift lights when done.

Besides those two and the angel eye upgrade, the only limits are your imagination when retrofitting.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards