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well, halos as they were/are martyrs and saints. Crosses -- well, the idea being that they sacrificed themselves for God and their fellow men.

The praise from the OCA.org and antiochian.org website is

Troparion (Tone 7) –

Let us praise the seven Maccabees,
with their mother Solomonia and their teacher Eleazar;
they were splendid in lawful contest
as guardians of the teachings of the Law.
Now as Christ’s holy martyrs they ceaselessly intercede for the world.

Kontakion (Tone 2) –

Seven pillars of the Wisdom of God
and seven lampstands of the divine Light,
all-wise Maccabees, greatest of the martyrs before the time of the martyrs,
with them ask the God of all to save those who honor you.