I suggest an email to the company first asking them for permission. Sometimes, to them, it would not matter but, to be on the safe side and to avoid any difficulties ask them for permission to use their graphics. Worst case they'll say no. Go ahead and do it for yourself but bear in mind this...there may be a 'fair use' policy which would allow for usage providing there is no personal gain. At any rate do what you have to. Without knowing what it is you plan to use I hope it works out.
