I asked this question before, but I want to make sure that it's okay because there are Hadiths which are against Crosses.
Al-Bukhaari narrated in his Saheeh from ‘Aa’ishah (may Allaah be pleased with her) that the Prophet (peace and blessings of Allaah be upon him) would never leave anything in his house on which there were any crosses without erasing them or – according to another report –cutting them out.
There is also a Hadith that mentions what one should do should he encounter a cross:
“Whoever among you sees an evil action (munkar), let him change it with his hand [by taking action], and if he cannot, then with his tongue [by speaking out], and if he cannot, then with his heart [by feeling that it is wrong], and that is the weakest of faith.” (Narrated by Muslim).
Muslim also narrated that Abu’l-Hayaaj al-Asadi said: “ ‘Ali (may Allaah be pleased with him) said to me: ‘Shall I not send you on the same mission that the Messenger of Allaah (peace and blessings of Allaah be upon him) sent me? Do not leave any image without blotting it out and do not leave any built-up grave without levelling it.’