GFX? Or actual 'effects' to gameplay?
1- x:\(DL_DA_TA)\gfx\Models folder(s) have all the png and x files there listed (obviously) as "anomalies" with numeral suffixes.
2- x:\Galciv2(or DA)\data\english\anomalies.xml of the upward compatible DL version. You may even change context by STR (Screens & English) files editing.