Girlfriend’s gift suggestion in low budget ?

I have 500 rps only and my girlfriend’s birthday is on this Monday (12-02-2012),I am not able to think that what should I give her? PLEASE SUGGEST……

Actually, we both are studying in a college at Delhi University( India). We are in relationship form past 18 months, last year too I gifted her a very large teddy bear for that I worked for a month thus I was able to give her that as a surprise.. I really love a lot my baby.
This year too I worked hard for three months giving tuitions at someone’s coaching centre but the owner is a big a fraud I get to know later and I doesn’t get a penny and there is no chance in future that I will get my pay as the centre is on rent ,his cell number is off now so I can’t do anything about it. She knows this. I have big plans this have not been happened. But still…..
I have thought some ideas please suggest me more based on these or any unique one, I just want to surprise her and I HAVE ONLY AND ONLY THIS 500 RPS NOTE( this is my whole month pocket money now god only knows how will I spent this month.
She said recently that she wants any inspirational book that can change her life so I am thinking about Anupam khair’s new out “The best about you is you !!” but it is very unromantic to giving a book to your girlfriend on her most special day of the year for her (in my view at least)..

She likes Sonu nigam songs too much and a big fan of SRK too.

She like to do sketching A LOT, I am thinking to give her a big sketch book and a good sketching pencil set. It’s like a big sheets and a professional set of sketching ( maybe its unromantic too) but I don’t know what it exactly called and also where I can find it in Delhi in this budget..(A little can be pushed if parents would give any for Holi)

An idea also I get that publish a calendar which have her photos on each month but again don’t know where I would find this in New Delhi in this rate and only one calendar I need to publish so soon.
She likes cakes a lot and south Indian food too, but cake will be ordered to her home every year so that is no use to give cake. I want to give her something that she cherish all her life.
Also suggest if in Delhi at any place (preferably have metro connectivity) any pocket friendly food joint that have awesome food (vegetarian only).

Please suggest any other gift ideas also. I really want to look happiness in her eyes on that day..
Please help me………
Please god help me, I need you here, I really want to make her day…
Please suggest something that her family wouldn’t notice as it would create problem for her

I already gifted her “A portrait of her on our first anniversary so that cannot be repeated.

please suggest any skeching set type thing so as I know she surely gonna love it..