In reply to Mike Hewitt:
As Alicia says, the area is stunning.
I went up a number of peaks on both sides of the Montenegrin/Albanian border late last summer, when only a few snow patches remained high on Maja Jezerces.
But at this time of year I'd expect there to be a lot of snow remaining.
Zla Kolata is a straightforward ascent with good waymarking.
The summit plateau is surprisingly broad and grassy, so is ideal for a high camp in settled conditions.
Waking up here to see the sun rise over Djeravica (highest mountain in Kosovo) was a memorable experience.
If you've got sufficient time it is worth considering a descent to Valbona (Albania) and coming back by another route (e.g. Maja e Rosit or Maja Jezerces).
However, bear in mind that permits are required to cross the border.
I obtained mine through Zbulo, for the modest charge of 5 euro:
http://zbulo.org/services/peaks-of-the-balkans-permits/
A visit to the border police station in Korita (outskirts of Plav) is needed to verify the Montenegrin permit.
In the end the border post at Vusanje was not in use when I passed, and nobody asked to see my permit; however, personally I wouldn't chance going without.
I would also highly recommend a visit to Grbaja valley, a 5 mile walk/drive from Gusinje.
The valley is beautiful in itself, and has some brilliant peaks to go at (e.g. Karanfili and Ocnjak).
Cheap accommodation is available in either the 'Eko-katuns' or the mountaineering hut.
For food supplies, Gusinje and Plav both have plenty of places to stock up on the basics.
The best map I could find was the easily available Peaks of the Balkans map at 1:60,000, which shows most of the waymarked routes.
The 1:30,000 Vektor maps for Valbona and Thethi (Albania) are great for contours, but not so good for footpaths.
Summitpost is a great source of information for mountain routes.
The Cicerone 'Mountains of Montenegro' guidebook is also helpful, but doesn't really cover the high hills.