The differences in ceremony really depend on the exact church your friend's fiance belongs to.
- some sui juris churches use vows, but traditionally most Eastern Christians do not (we are married by the priest, the priest is not a witness to us conferring the sacrament on each other)
- the length-- in the UGCC the wedding ceremony itself is a good hour-- if you do a combined wedding with divine liturgy, you can easily be looking at 1.5-2 hours, some churches will do just the wedding ceremony with the sharing of the common cup for husband and wife
- in most churches the entire ceremony should be sung/chanted
- there is generally two parts to the ceremony, the betrothal and then wedding. The betrothal part begins in the back where the engaged couple pledges that they are free to marry and want to marry their fiance. They then walk down the aisle together (no groom waiting by the alter and the bride walking down with her father)
- there is a crowing and something known as the the dance of Isaiah, which is when the priest leads the man and wife around the tripod.
- there ceremony must be done by a priest, not a deacon (again see the point about the priest conferring the sacrament, not the couple).
I am sure there is plenty more, but those are the big ones that come to mind for me right now.
She should really speak with the priest performing the wedding to learn about the traditions typically incorporated into the ceremony and if there is anything special she needs-- such as a smaller bouquet to present to the Theotokos.
For the reception, this will really depend on the groom and his family culture. I can't really think of any specific 'Easter' reception traditions as much as just Ukrainian, Greek, Russian, Arab, etc reception traditions.
While getting a small icon for each guest is admirable, I could also see that getting pricey for a budget conscious bride if there are a lot of guests and you want quality icons. I would plan on at least $20 each for a small icon. Maybe there are cheaper options out there? I just haven't seen them.
To be honest, for my wedding we had our florist make crowns for us out of green leaves and they worked great, but they do dry out and would not be usable for future couples. I am not sure where you could get permanent ones.
Hope that helped a little.