Forza Motorsport 4's custom livery editor is a hugely powerful tool in the right hands. The crew at Turn 10 has been exceedingly clever about this, allowing passionate fans to build and share more custom and replica designs than they would ever have time to make in-house.

Lots+and+<i>lots</i>+of+shapes.

It needs to be firmly stated, however, that the gamers putting these incredible creations together aren't doing so with imported images; they're doing it with nothing but shapes.Forza's supremely talented community of painters place, stretch, move, skew, rotate, mask and fade layer upon layer upon layer to build amazing designs like the ones that follow.These are NOT designs that come with Forza 4 out of the box; these are completely custom made. Mouse over the pics for a glimpse of the car in its default paint scheme.

Vinyl group by Mekac

There are a lot of pretty tragic girl vinyls available via the Storefront, but this one is an exception.

Design by xXsuzuki88Xx

You don't need DLC to get Ken Block's Gymkhana 3 Fiesta in Forza 4. Swap it to all-wheel drive, tweak the engine, and finish it off with this paintjob.

Design by sevaeL daeD

Long-time Gran Turismo fans should remember this one; this was the paint scheme that came with the Mitsubishi GTO's racing modification back in the original Gran Turismo. It's a cool homage to a true classic.

Design by |OMEGA MAN|

Looks like them Duke boys is at it again...

Design by Skafa Designs

This is the wrong car, but it still looks pretty awesome. Forza painters have a habit of improvising when the right car isn't available.

Design by tsbsfuran

This looks great. The beat-up rustbucket look positively oozes old-school charm. It's begging to be tuned and taken out onto the drag strip as a wolf in sheep's clothing.

Vinyl group by afxwinter

This has got to be one of the coolest vinyls on the entire Storefront. Ludicrously bad-ass.

Design by SEANO

The Forza 4 Storefront is full of racing replicas from all over the world. NASCAR, DTM, BTCC, you name it. Only Forza fans from down under will likely recognise this one; it's the Sierra driven by Australian touring car legend Dick Johnson in the 1988 Australian Touring Car Championship. It's here because it's a classic little car, but mostly because Dick Johnson is an awesome name.

Design by ABARAMAN

There's something for everyone up on the Forza 4 Storefront. Yes, even My Little Pony fans. Props for designing it on a car not only named after a horse, but is also the most iconic pony car of all time.

Design by ||xEZEKiELx||

If you're this hardcore, well, you're probably not playing Forza 4 anymore. For all of you who prefer Battlefield 3, Clint Eastwood probably said it best in The Rookie: "Whoever defaced that work of art by painting it that colour, ought to have his ass removed."

Vinyl group by RedlineDT

It seems only fitting to put an iconic vinyl of Arnold Schwarzenegger on the vehicle he's most famous for championing.

Design by Aturu WRC

It's nice one of the most popular designs for the XB, besides the dozens of Mad Max MFP Pursuit Specials and the odd Allan Moffat replica, is Eric Bana's Beast. He is, after all, the bloke who showed this car to the world via his documentary.There are thousands and thousands of designs and vinyl groups on the Forza 4 Storefront already; this is just a tiny slice of all the great stuff gamers the world over have crafted. Click through the the gallery to see high-res versions of the cars above.Forza fans: what are some impressive custom creations we haven't seen yet? Let us know your favourites below!