If the person is interested in doing small basic shapes instead of a 1/2 sheet, you could do three small balloons. That waythey each get one with their own name on it so it feels alittle more special and personal. Plus it leaves room for being a little more creative decorating wise[you can go simple and just star it then pipe a name OR you can add small decorations and details] and coloring options.
If they would prefer to keep a 1/2 sheet you could do a classic "Winter Wonderland" type theme. "winter white" base color, with winter things like snowflakes and snow covered trees, maybe a snowball fight. Something classic, simple, but lovely too.
GOOD LUCK!!
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