YULIA
If you look in the mags now it is very Contemporary to have 2
different colored sleeves ,,,
but i understand you don`t like it this idea ,,,
If have you knitted it from the bottom up i would advice unraveling a
bit of the top ,,, add another color and knit 2 rows of the new color
after one row of the original color ,, if it is a Raglan , do it in
the round !!!!
than do the same for the Sleeve ribbed end !!!
If you knitted top down you can make same idea at the bottom of the
sweater ,,
best of luck NOW you are using your creativity !!!!
mirjam