currently, my bedroom concept is bule & white. But I want to change the wood tone. Because blue & white tone gives a feeling of coldness. So, I want to give a feeling of warmth. And I want to put some plants in my room.

Hi, Julia^^
Thank you for sending your homework. 
A wood-tone theme sounds great. 
_T. SHAY^^
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currently, my bedroom concept is bule & white.
>>Currently, my bedroom concept is blue and white.
OR: Currently, my bedroom theme is blue and white.
But I want to change the wood tone.
>>But I want to change it to a wood-tone theme.
Because blue & white tone gives a feeling of coldness.
>>It's because blue and white give off a feeling of coldness.
So, I want to give a feeling of warmth.
>>I want a theme that makes me feel warm.
OR: I want a them that give me a sense of warmth.
And I want to put some plants in my room.
>>Correct
OR: And I want to some plants to my room.