So can someone please enlighten me to these alt art Tycho cards??

http://boardgamegeek.com/thread/1281267/star-wars-x-wing-2015-spring-tournament-kit

Sadly, I think the real answer is much simpler ..

They can sell more toys.

It's also a film technique, so that you can distinguish the characters from each other while watching the movie. Like in Top Gun when they write the pilot's call sign on the front of the helmet, because they all look the same while wearing the oxygen mask.

Major problem in nearly all war films.

Because soldiers in real life tend to wear the same uniform and real unit SOPs (standard ops proceedure) means you wear things in the same place and carry the same weapon so that if needed you can find your mates kit or ammo instantly it means they dont 'stand out' as characters.

so you have to have the 'guy with the cap' when everyone else is in helmets, 'the guy with the sleeves ripped off his jacket' , 'the guy with the facial scar' etc etc.

Its also the reason that film soldiers never move or act like real ones as you'd hardly see them if they were moving tactically but it makes bad cinema... you need them to walk silouheted across skylines , saving private ryan style.... something that would be very short lived habit for real soldiers in sight of the enemy

Yeah cinema does require us to make characters obvious to the least observant members of the audienc.

With the caveat that Star Wars is fictional and so their isn't really a right answer, despite the fact that Lucas has published several works that would claim that they have authoritative answers for this fictional universe. I would like to put forward what "feel right" to me based solely on the movies.

In Star Wars(A New Hope) the Rebellion is primarily human, they only have 2 different fighter craft and all the flight suits look the same. By the time Return of the Jedi Rolls around there is a much larger alien presence in the rebellion. But the rebellion is just a random smattering of aliens like the bar on Tatooine or in Jaba's Palace. Most of the Aliens we see are Mon Calamari.

We also see a lot of Mon Calamari cruisers in Jedi that we never saw before. (I admit the only time we really saw the rebel's space fleet was at the end of Empire, but then the biggest ships they had were frigates. It is also worth pointing out that the rebel base on Yavin was the rebels' main base. The Empire seems pretty confident that if they can find that base, they can destroy the rebellion. And we don't see any cruiser size ships anywhere at the base or at the battle of Yavin. You do see a lot of corvettes in the Battle of Endor though. When I was younger I always wondered why they even bothered with those corvettes.

All this leads me to one conclusion. The Rebellion is just a Rebellion it as a Rebel Alliance. In fact the Rebellion almost never refers to themselves as a "rebellion" and almost always refer themselves as "The Alliance". The Rebellion isn't a single miltary force that rose up to fight the Empire, they are an Alliance, and if actual rebellions from earth history can tell us anything. They probably represent military forces and hardware that was originally designed for other purposes re-purposed, and brought together to fight the Empire.

For me the make up of the Rebel forces tells a compelling story. Despite the fact that the Empire has won almost every major battle. (Even though they lost their Deathstar in the process the Empire did find and destroy the rebel base on Yavin) The Rebel Alliance has grown. Remember when Lea says to Tarkin "The more you tighten your grip... the more star systems will slip though your fingers". This is how the rebelion really fight the empire (It is how every Rebellion has ever fought every Empire)

They're in different colored flight suits because Lucas had to justify paying wardrobe consultants.